| ; RUN: llc < %s -march=x86-64 -mattr=+sse2 | FileCheck %s |
| |
| ; This test makes sure that the compiler does not crash with an |
| ; assertion failure when trying to fold a vector shift left |
| ; by immediate count if the type of the input vector is different |
| ; to the result type. |
| ; |
| ; This happens for example when lowering a shift left of a MVT::v16i8 vector. |
| ; This is custom lowered into the following sequence: |
| ; count << 5 |
| ; A = VSHLI(MVT::v8i16, r & (char16)15, 4) |
| ; B = BITCAST MVT::v16i8, A |
| ; VSELECT(r, B, count); |
| ; count += count |
| ; C = VSHLI(MVT::v8i16, r & (char16)63, 2) |
| ; D = BITCAST MVT::v16i8, C |
| ; r = VSELECT(r, C, count); |
| ; count += count |
| ; VSELECT(r, r+r, count); |
| ; count = count << 5; |
| ; |
| ; Where 'r' is a vector of type MVT::v16i8, and |
| ; 'count' is the vector shift count. |
| |
| define <16 x i8> @do_not_crash(i8*, i32*, i64*, i32, i64, i8) { |
| entry: |
| store i8 %5, i8* %0 |
| %L5 = load i8, i8* %0 |
| %I8 = insertelement <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, i8 %L5, i32 7 |
| %B51 = shl <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>, %I8 |
| ret <16 x i8> %B51 |
| } |
| |
| ; CHECK-LABEL: do_not_crash |
| ; CHECK: ret |
| |
